Oki Pos 407II - Manual (Page 60)

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13-3. Cable Connections
The followings are a recommended interface cable connections.
Note: Use shielded wire less than  m in length.
13-4. Electrical Characteristics
Voltage Data signal Control signal Binary status
- V to - V Mark OFF 
+ V to + V Space ON 0
1
2
3
4
5
6
1
2
3
4
5
6
7
8
20
FG FG
TXD
RXD
RTS
CTS
DSR
20
25
7 SG
DTR
INIT
3
2
7
8
6
5
1
4
TXD
RXD
RTS
CTS
DSR
SG
DCD
DTR
Printer side Host side
25 pin 9 pin